Last edited by Vudolrajas
Thursday, May 14, 2020 | History

2 edition of Operation of the computer model for direct atomic oxygen exposure of Earth satellites found in the catalog.

Operation of the computer model for direct atomic oxygen exposure of Earth satellites

Operation of the computer model for direct atomic oxygen exposure of Earth satellites

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  • 14 Currently reading

Published by Boeing Defense & Space Group, National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in [Seattle, Wash.], Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Applications programs (Computers),
  • Atomic collisions.,
  • Earth orbital environments.,
  • Exposure.,
  • Low Earth orbits.,
  • Oxygen atoms.,
  • User manuals (Computer programs)

  • Edition Notes

    StatementR.J. Bourassa ... [et al.].
    SeriesNASA contractor report -- 198188., NASA contractor report -- NASA CR-198188.
    ContributionsBourassa, Roger J., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15414963M

    Earth and collecting publically available data since the early s, these sensors have been primarily carried aboard free-flying, unmanned satellites. These satellites have typically been placed into sun-synchronous polar orbits that allow for repeat imaging of the entire surface of the Earth with approximately the same.   Beam predominantly neurtral atomix oxygen with ion content of less than 1 percent at energies below 30 electron volts. Atomic oxygen arrival flux is controllable within range of to atoms/cm2-sec. Vacuum ultraviolet radiation emitted by source can irradiate samples or be blocked allowing only atomic oxygen exposure.

    Abstract. The effects of atomic oxygen on boron nitride, silicon nitride, solar cell interconnects used on the Intelsat 6 satellite, organic polymers, and MoS{sub 2} and WS{sub 2} dry lubricant have been studied in low Earth orbit (LEO) flight experiments and in our ground-based simulation facility at Los Alamos National Laboratory. Low Earth Orbital Atomic Oxygen Interactions with Spacecraft Materials - Volume - Bruce A. Banks, Kim K. de Groh, Sharon K. MillerCited by:

    In very low Earth orbit there are (at least) two problems; aerodynamic drag, and atomic oxygen (O rather than O2). Drag can be compensated with a low thrust from an ion engine. Question: But what exactly makes atomic oxygen "bad". How exactly does atomic oxygen cause problems for spacecraft in . Although the Long Duration Exposure Facility (LDEF) had exposed materials with a fixed orientation relative to the ambient low-Earth-orbital environment, arrival of atomic oxygen is angularly distributed as a result of the atomic oxygen's high temperature Maxwellian velocity .


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Operation of the computer model for direct atomic oxygen exposure of Earth satellites Download PDF EPUB FB2

OPERATION OF FLUXAVG, THE COMPUTER MODEL FOR DIRECT ATOMIC OXYGEN EXPOSURE OF EARTH SATELLITES FOREWORD This report describes the operation of the computer model FLUXAVG, which was developed to predict direct atomic oxygen exposure to satellite surfaces.

Boeing Defense & Space. Atomic oxygen flux is a function of orbit altitude, the orientation of the orbit plan to the Sun, solar and geomagnetic activity, and the angle between exposed surfaces and the spacecraft heading.

We have developed a computer model to predict the atomic oxygen exposure of spacecraft in low Earth : R. Bourassa, P. Gruenbaum, J. Gillis, C. Hargraves. One of the primary causes of material degradation in low Earth orbit (LEO) is exposure to atomic oxygen.

When atomic oxygen molecules collide with an orbiting spacecraft, the relative velocity is 7 to 8 km/sec and the collision energy is 4 to 5 eV per atom.

Under these conditions, atomic oxygen may initiate a number of chemical and physical reactions with exposed materials. In the upper reaches of the atmosphere, about to miles above the Earth, atomic oxygen is created by exposure to intense solar ultraviolet light.

Oxygen molecules (two oxygen atoms bonded together as O2) decompose into two separate oxygen atoms, or atomic oxygen. Abstract: Atomic oxygen is one of the most important environmental element impacting spacecraft performance in LEO space environment.

Materials used on the surface of the spacecraft may be eroded away through the reaction of Atomic oxygen, which also causes damage to spacecraft components, seriously reducing the spacecraft's orbit : An Jing, Zhang Wei, Yang Dongsheng. A 2-dimensional model is used to provide quantitative indications of the attenuation of atomic oxygen flux as a function of distance into a parallel walled cavity.

The degree of erosion relative is compared between the various interior locations and the external surface of an LEO spacecraft. Size: 3MB. Bourassa's 10 research works with 23 citations and 69 reads, including: Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF.

We have developed a computer model to predict the atomic oxygen exposure of spacecraft in low Earth orbit. The application of this computer model is discussed. Read more. Shuttle aglow with atomic oxygen.

Today, all missions below about km need to be designed to resist atomic oxygen, such as Europe’s Earth-watching Sentinel satellites. The precise extent of atomic oxygen effects varies with the 11 years of the solar cycle. Atomic oxygen. The effects of atomic oxygen (monatomic oxygen) bombardment were originally highlighted with the early shuttle flights, by a visible effect on exposed polymer surfaces such as Kapton, where changes in characteristics due to atomic oxygen were found to cause undesirable temperature excursions in low Earth orbit and shorten the useful lifetime of many spacecraft components.

Atomic Oxygen Protection of Materials in Low Earth Orbit Bruce A. Banks Glenn Research Center, Cleveland, Ohio significantly eroded as a result of exposure to atomic oxygen in low Earth orbit (LEO).

Several clear from the in-space photograph that the coating was only partially attached allowing direct atomic oxygen attack of the. Although atomic oxygen attack on internal or interior surfaces may not have direct exposure to the LEO atomic oxygen flux, scattered impingement can have can have serious deg radation effects.

Atomic Oxygen is created in a lab by separating O 2 (the oxygen that naturally appears in Earth’s atmosphere) into O (one atom of oxygen—otherwise known as atomic oxygen). Photo Credit: NASA When spacecraft travel in low Earth orbit (where crewed vehicles and the International Space Station fly), the atomic oxygen formed from the residual atmosphere can react with spacecraft surfaces.

Atomic oxygen flux (parallel to the Earth's horizon) relative to the flux at normal incidence Figure 5. LEO atomic oxygen arrival flux versus arrival angle from ram direction for surfaces perpendicular to the ram direction.

Figure 6. LEO Atomic oxygen energy versus orbital altitude for o inclined circular orbits. The presence of Atomic Oxygen (AO) in the Low Earth Orbit (LEO) environment is considered one of the main reasons for the degradation of the surfaces exposed to the Space Environment A spacecraft’s orbital velocity of km sec-1 may expose a spacecraft to a stream of AO at energy of approximately 5 eV.

At this energy, atomic oxygen initiates a number of chemical and physical reactions with. bulge in the atmosphere is pushed forward such that the peak of the atomic oxygen density occurs at approximately 3 P.M.

rather than solar noon. As a consequence, anti-solar facing surfaces such as the back side of solar arrays receive 25 percent more atomic oxygen fluence than the solar facing surfaces as the spacecraft orbits the Earth (ref.

3).Cited by: Lessons Learned from Atomic Oxygen Interaction with Spacecraft Materials in Low Earth Orbit There have been five Materials International Space Station Experiment (MISSE) passive experiment carriers (PECs) (MISSE ) to date that have been launched, exposed in space on the exterior of International Space Station (ISS) and than returned to Earth for analysis.

Satellites and Power •Since the launch of Sputnik, thousands of satellites have been launched for variety of purposes. •However, keeping a satellite in orbit is a challenging prospect, since it involves spending energy to push against Earth’s gravity well, to spend energy to. Neutral atomic oxygen (AO)—the dominant atmospheric species at typical low Earth orbit altitudes—is responsible for the erosion, or other degradation, of many satellite materials.

Therefore, AO has become an important consideration for spacecraft designers and manufacturers. The study of AO is also of interest to atmospheric physicists because it is involved in many of the chemical Cited by: Precise prediction on atomic oxygen undercutting by numerical simulation technique plays an importance role for long lifetime spacecraft design.

A Monte Carlo mathematical model is presented to predict the undercutting process interaction between atomic oxygen and polyimide films of spacecraft in low earth orbital by: 6. Space Weather impacts on satellites at different orbits! 1" Outline!! Intro of man-made satellites"!

Orbits" • Atomic oxygen During exposure to multi-MeV protons Electronics degrade due to total radiation dose Induced Voltage Time.The EUMETSAT Mission Control Centre (MCC) is based at our headquarters in Darmstadt, Germany, and is responsible for the safe operation of all satellites.

Comprised of two main control rooms, one for the geostationary missions and the other for the low Earth orbit missions, it provides the necessary monitoring and control of all operational.The atomic oxygen density is evaluated with standard models of the Earth's atmosphere.

The orientation of the impacted surface is defined in terms of the attitude vector specified for the orbit generator. Physical modelling The final goal of an atomic oxygen analysis is to assess the fluence of atmospheric particles to outer surfaces of satellites.